<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Document</title>
</head>
<body>
	<script>
	var a = new Array;
	Array.prototype.show = function(){
		alert('array')
	};
	Object.prototype.show = function () {
		alert('object')
	}
	Function.prototype.show = function(){
		alert("function")
	};

	a.show();
	Array.show()

	console.dir(Array)
	</script>
</body>
</html>